For agricultural systems, nitrogen (N) is an extremely important nutrient and is the most significant nutrient-limiting factor for productivity and constraining economic sustainability. Biochar-based N fertilizers (BBNFs) normally use a biochar/polymer coating of a synthetic fertilizer granule or through utilizing the structure of biochar for preparation. Biochar coating of mineral fertilizers is an entirely promising approach in the development of controlled-release fertilizers, providing a barrier to the dissolution and transport of nutrients thus limiting N loss pathways and mitigating environmental problems. Pseudo-first-order and pseudo-second-order kinetic models were used to investigate the cumulative N release from BBNFs. In recent years, there has been a growing focus on the impact of BBNFs on N cycling, with implications for both agronomic and environmental effects. While there is good evidence that BBNFs can improve N use efficiency, more research is needed to determine their ideal application rates and how these affect their economic feasibility when compared to traditional fertilizers.